如何使用 TabLayout 在 Fragment 中使用 CardView 行实现 RecyclerView

Posted 2023-03-22

【中文标题】如何使用 TabLayout 在 Fragment 中使用 CardView 行实现 RecyclerView

【英文标题】：How to implement RecyclerView with CardView rows in a Fragment with TabLayout

【发布时间】：2016-01-03 17:49:19

【问题描述】：

我想在一个使用 TabLayout 的 Activity 中实现一个 ListFragment，这样我就可以在不同的列表之间滑动。最后它应该成为一个预订应用程序，以便您可以在不同的学科之间进行选择并使用它预订特定的时间段。然而到目前为止，我只实现了 ListActivity 或选项卡式活动（来自 android studio 的标准活动），但不能同时做两者。如果有人能在这方面提供帮助，我会很高兴。 选项卡式活动：

public class Diciplines extends AppCompatActivity 

    /**
     * The @link android.support.v4.view.PagerAdapter that will provide
     * fragments for each of the sections. We use a
     * @link FragmentPagerAdapter derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * @link android.support.v4.app.FragmentStatePagerAdapter.
     */
    private SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The @link ViewPager that will host the section contents.
     */
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_diciplines);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);


        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            
        );

    


    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_diciplines, menu);
        return true;
    

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) 
            return true;
        

        return super.onOptionsItemSelected(item);
    


    /**
     * A @link FragmentPagerAdapter that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter 

        public SectionsPagerAdapter(FragmentManager fm) 
            super(fm);
        

        @Override
        public Fragment getItem(int position) 
            // getItem is called to instantiate the fragment for the given page.
            // Return a PlaceholderFragment (defined as a static inner class below).
            return PlaceholderFragment.newInstance(position + 1);
        

        @Override
        public int getCount() 
            // Show 3 total pages.
            return 3;
        

        @Override
        public CharSequence getPageTitle(int position) 
            switch (position) 
                case 0:
                    return "SECTION 1";
                case 1:
                    return "SECTION 2";
                case 2:
                    return "SECTION 3";
            
            return null;
        
    

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment 
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) 
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        

        public PlaceholderFragment() 
        

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) 


            View rootView = inflater.inflate(R.layout.fragment_diciplines, container, false);
            TextView textView = (TextView) rootView.findViewById(R.id.section_label);
            textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
            return rootView;
        
    

而且我想将这样的列表视图包含到上部选项卡式活动中：

public class DailyCalendar extends ListActivity 


public void onCreate(Bundle icicle) 
    super.onCreate(icicle);
    String[] values = new String[]  "9am" ,"10am" ,"11am", "12pm",
    "1pm" , "2pm", "3pm", "4pm" , "5pm", "6pm", "7pm", "8pm", "9pm";
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, values);
    setListAdapter(adapter);


@Override
protected void onListItemClick(ListView listView, View view, int position, long id) 
    String item = (String) getListAdapter().getItem(position);
    Toast.makeText(this, item + " selected", Toast.LENGTH_LONG).show();

感谢您的帮助！

【问题讨论】：

您可以将一个普通的 ListView，而不是 ListActivity 包含到另一种类型的 Activity 中。或者您可以包含一个 ListFragment。但我更喜欢简单的 ListViews。

用您自己的具有您的 ListViews 的片段替换虚拟片段（由 Android Studio 生成的片段）。他们每个人都可以加载他们需要的任何数据并相应地控制他们的 UI。

【参考方案1】：

这是一个使用 TabLayout 和 RecyclerView 的简单示例，每行都有一个 CardView。

首先是MainActivity，它设置了ViewPager和TabLayout：

public class MainActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        // Get the ViewPager and set it's PagerAdapter so that it can display items
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        PagerAdapter pagerAdapter =
                new PagerAdapter(getSupportFragmentManager(), MainActivity.this);
        viewPager.setAdapter(pagerAdapter);

        // Give the TabLayout the ViewPager
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
        tabLayout.setupWithViewPager(viewPager);

        // Iterate over all tabs and set the custom view
        for (int i = 0; i < tabLayout.getTabCount(); i++) 
            TabLayout.Tab tab = tabLayout.getTabAt(i);
            tab.setCustomView(pagerAdapter.getTabView(i));
        

    


    @Override
    public void onResume() 
        super.onResume();
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
        int id = item.getItemId();

        if (id == R.id.action_settings) 
            return true;
        

        return super.onOptionsItemSelected(item);
    

    class PagerAdapter extends FragmentPagerAdapter 

        String tabTitles[] = new String[]  "Tab One", "Tab Two", "Tab Three" ;
        Context context;

        public PagerAdapter(FragmentManager fm, Context context) 
            super(fm);
            this.context = context;
        

        @Override
        public int getCount() 
            return tabTitles.length;
        

        @Override
        public Fragment getItem(int position) 

            switch (position) 
                case 0:
                    return new BlankFragment();
                case 1:
                    return new BlankFragment();
                case 2:
                    return new BlankFragment();
            

            return null;
        

        @Override
        public CharSequence getPageTitle(int position) 
            // Generate title based on item position
            return tabTitles[position];
        

        public View getTabView(int position) 
            View tab = LayoutInflater.from(MainActivity.this).inflate(R.layout.custom_tab, null);
            TextView tv = (TextView) tab.findViewById(R.id.custom_text);
            tv.setText(tabTitles[position]);
            return tab;
        

    

activity_main.xml：

<RelativeLayout
    android:id="@+id/main_layout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context=".MainActivity">


    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_
        android:layout_
        android:layout_alignParentTop="true"
        android:background="?attr/colorPrimary"
        android:elevation="6dp"
        android:minHeight="?attr/actionBarSize"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        />

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        app:tabMode="fixed"
        android:layout_below="@+id/toolbar"
        android:layout_
        android:layout_
        android:background="?attr/colorPrimary"
        android:elevation="6dp"
        app:tabTextColor="#d3d3d3"
        app:tabSelectedTextColor="#ffffff"
        app:tabIndicatorColor="#ff00ff"
        android:minHeight="?attr/actionBarSize"
        />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_below="@+id/tab_layout"
        android:layout_
        android:layout_
        />

</RelativeLayout>

用于 TabLayout 中每个选项卡的 custom_tab.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_
    android:layout_>
    <TextView
        android:id="@+id/custom_text"
        android:layout_
        android:layout_
        android:background="?attr/selectableItemBackground"
        android:gravity="center"
        android:textSize="16dip"
        android:textColor="#ffffff"
        android:singleLine="true"
        />
</LinearLayout>

这里是 BlankFragment 类，它使用 RecyclerView 来显示一个列表：

import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;;

public class BlankFragment extends Fragment 

    public BlankFragment() 
        // Required empty public constructor
    

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);

    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_blank, container, false);

        RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
        rv.setHasFixedSize(true);
        MyAdapter adapter = new MyAdapter(new String[]"test one", "test two", "test three", "test four", "test five" , "test six" , "test seven");
        rv.setAdapter(adapter);

        LinearLayoutManager llm = new LinearLayoutManager(getActivity());
        rv.setLayoutManager(llm);

        return rootView;
    

fragment_blank.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_recycler_view"
        android:layout_
        android:layout_ >
    </android.support.v7.widget.RecyclerView>
</RelativeLayout>

用于 RecyclerView 列表的card_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ >

    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_
        android:layout_margin="10dp"
        android:layout_
        card_view:cardCornerRadius="4dp"
        card_view:elevation="14dp">

        <RelativeLayout
            android:layout_
            android:layout_>

        <ImageView
            android:id="@+id/iv_image"
            android:layout_
            android:layout_
            android:src="@drawable/abc_btn_radio_material">
        </ImageView>

        <TextView
            android:id="@+id/tv_text"

            android:layout_toRightOf ="@+id/iv_image"
            android:layout_
            android:layout_
            android:gravity="center" >
        </TextView>

            <TextView
                android:id="@+id/tv_blah"
                android:layout_
                android:layout_
                android:text="blah blah blah......"
                android:layout_below="@+id/tv_text"
                android:layout_toRightOf="@+id/iv_image"
                android:layout_toEndOf="@+id/iv_image">
            </TextView>

        </RelativeLayout>
    </android.support.v7.widget.CardView>

</RelativeLayout>

RecyclerView 的 MyAdapter 类，这是非常基本的，只是在其中一个 TextView 中设置文本：

import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> 
    private String[] mDataset;

    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder
    public static class MyViewHolder extends RecyclerView.ViewHolder 
        public CardView mCardView;
        public TextView mTextView;
        public MyViewHolder(View v) 
            super(v);

            mCardView = (CardView) v.findViewById(R.id.card_view);
            mTextView = (TextView) v.findViewById(R.id.tv_text);
        
    

    // Provide a suitable constructor (depends on the kind of dataset)
    public MyAdapter(String[] myDataset) 
        mDataset = myDataset;
    

    // Create new views (invoked by the layout manager)
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
                                                     int viewType) 
        // create a new view
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.card_item, parent, false);
        // set the view's size, margins, paddings and layout parameters
        MyViewHolder vh = new MyViewHolder(v);
        return vh;
    

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) 
        holder.mTextView.setText(mDataset[position]);
        holder.mCardView.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                String currentValue = mDataset[position];
                Log.d("CardView", "CardView Clicked: " + currentValue);
            
        );
    

    @Override
    public int getItemCount() 
        return mDataset.length;
    

使用的 Gradle 依赖项：

dependencies 
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.1'
    compile 'com.android.support:design:23.0.1'
    compile 'com.android.support:cardview-v7:23.0.1'
    compile 'com.android.support:recyclerview-v7:23.0.1'

结果如下：

【讨论】：

你认为你能在这里帮助我吗？ ***.com/questions/41134470/…

这不会导致多次填充片段吗？

ViewPager 和 PagerAdapter 的固有功能会多次加载每个 Fragment。防止这种情况的唯一方法是将屏幕外页面限制设置为片段数（减一）。

如果我想为项目搜索实现 searchview 我该怎么办？

@AkhileshChobey 您只需为每个选项卡使用不同的适配器。